US8578825B2 - Table saw with mechanical fuse - Google Patents

Table saw with mechanical fuse Download PDF

Info

Publication number
US8578825B2
US8578825B2 US13/538,422 US201213538422A US8578825B2 US 8578825 B2 US8578825 B2 US 8578825B2 US 201213538422 A US201213538422 A US 201213538422A US 8578825 B2 US8578825 B2 US 8578825B2
Authority
US
United States
Prior art keywords
swing arm
mechanical fuse
power tool
arm assembly
connection portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
US13/538,422
Other versions
US20120325065A1 (en
Inventor
Stephen C. Oberheim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Robert Bosch Tool Corp
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US12/548,201 priority Critical patent/US8210076B2/en
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to US13/538,422 priority patent/US8578825B2/en
Assigned to ROBERT BOSCH TOOL CORPORATION reassignment ROBERT BOSCH TOOL CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). Assignors: CREDO TECHNOLOGY CORPORATION
Assigned to ROBERT BOSCH GMBH, CREDO TECHNOLOGY CORPORATION reassignment ROBERT BOSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OBERHEIM, STEPHEN C.
Publication of US20120325065A1 publication Critical patent/US20120325065A1/en
Publication of US8578825B2 publication Critical patent/US8578825B2/en
Application granted granted Critical
Application status is Active legal-status Critical
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27GACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G19/00Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
    • B27G19/02Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/081With randomly actuated stopping means
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/768Rotatable disc tool pair or tool and carrier
    • Y10T83/7684With means to support work relative to tool[s]
    • Y10T83/773Work-support includes passageway for tool [e.g., slotted table]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/869Means to drive or to guide tool
    • Y10T83/8748Tool displaceable to inactive position [e.g., for work loading]
    • Y10T83/8749By pivotal motion

Abstract

A power tool in one embodiment includes a work-piece support surface, a swing arm assembly movable along a swing path between a first swing arm position whereat a portion of a shaping device supported by the swing arm assembly extends above the work-piece support surface and a second swing arm position whereat the portion of the shaping device does not extend above the work-piece support surface, a mechanical fuse positioned to maintain the swing arm assembly in the first swing arm position, an actuator configured to apply a force to the mechanical fuse sufficient to break the mechanical fuse and to force the swing arm assembly away from the first swing arm position and toward the second swing arm position, and a control system configured to actuate the actuator in response to a sensed condition.

Description

This application is a divisional of application Ser. No. 12/548,201, filed on Aug. 26, 2009 (now U.S. Pat. No. 8,210,076), the disclosure of which is hereby totally incorporated by reference in its entirety

Cross-reference is made to U.S. Utility patent application Ser. No. 12/547,818 entitled “Table Saw with Actuator Module” by Mehta et al., which was filed on Aug. 26, 2009; U.S. Utility patent application Ser. No. 12/547,859 entitled “Table Saw with Dust Shield” by Chung, which was filed on Aug. 26, 2009; U.S. Utility patent application Ser. No. 12/547,912 entitled “Table Saw with Positive Locking Mechanism” by Chung et al., which was filed on Aug. 26, 2009; U.S. Utility patent application Ser. No. 12/547,977 entitled “Table Saw with Belt Stop” by Chung, which was filed on Aug. 26, 2009; U.S. Utility patent application Ser. No. 12/548,035 entitled “Table Saw with Alignment Plate” by Chung et al., which was filed on Aug. 26, 2009; U.S. Utility patent application Ser. No. 12/548,156 entitled “Table Saw with Swing Arm Support” by Chung et al., which was filed on Aug. 26, 2009; U.S. Utility patent application Ser. No. 12/548,236 entitled “Table Saw with Pressure Operated Actuator” by Fischer et al., which was filed on Aug. 26, 2009; U.S. Utility patent application Ser. No. 12/548,263 entitled “Table Saw with Reset Mechanism” by Groth et al., which was filed on Aug. 26, 2009; U.S. Utility patent application Ser. No. 12/548,280 entitled “Table Saw with Linkage Drop System” by Holmes et al., which was filed on Aug. 26, 2009; U.S. Utility patent application Ser. No. 12/548,317 entitled “Table Saw with Ratchet Mechanism” by Chung et al., which was filed on Aug. 26, 2009; and U.S. Utility patent application Ser. No. 12/548,342 entitled “Table Saw with Actuator Reset Mechanism” by Chung, which was filed on Aug. 26, 2009, the entirety of each of which is incorporated herein by reference. The principles of the present invention may be combined with features disclosed in those patent applications.

FIELD

The present disclosure relates to power tools and more particularly to power tools with exposed shaping devices.

BACKGROUND

A number of power tools have been produced to facilitate forming a work piece into a desired shape. One such power tool is a table saw. A wide range of table saws are available for a variety of uses. Some table saws such as cabinet table saws are very heavy and relatively immobile. Other table saws, sometimes referred to as jobsite table saws, are relatively light. Jobsite table saws are thus portable so that a worker can position the table saw at a job site. Some accuracy is typically sacrificed in making a table saw sufficiently light to be mobile. The convenience of locating a table saw at a job site, however, makes job site table saws very desirable in applications such as general construction projects.

All table saws, including cabinet table saws and job site table saws, present a safety concern because the saw blade of the table saw is typically very sharp and moving at a high rate of speed. Accordingly, severe injury such as severed digits and deep lacerations can occur almost instantaneously. A number of different safety systems have been developed for table saws in response to the dangers inherent in an exposed blade moving at high speed. One such safety system is a blade guard. Blade guards movably enclose the saw blade, thereby providing a physical barrier that must be moved before the rotating blade is exposed. While blade guards are effective to prevent some injuries, the blade guards can be removed by a user either for convenience of using the table saw or because the blade guard is not compatible for use with a particular shaping device. By way of example, a blade guard is typically not compatible with a dado blade and must typically be removed when performing non-through cuts.

Table saw safety systems have also been developed which are intended to stop the blade when a user's hand approaches or touches the blade. Various stopping devices have been developed including braking devices which are physically inserted into the teeth of the blade. Such approaches are extremely effective. Upon actuation of this type of braking device, however, the blade is typically ruined because of the braking member. Additionally, the braking member is typically destroyed. Accordingly, each time the safety device is actuated; significant resources must be expended to replace the blade and the braking member. Another shortcoming of this type of safety device is that the shaping device must be toothed. Moreover, if a spare blade and braking member are not on hand, a user must travel to a store to obtain replacements. Thus, while effective, this type of safety system can be expensive and inconvenient.

Some safety systems incorporating blade braking systems also move the blade below the surface of the table saw once the blade has been stopped. In this type of system, a latch is typically used to maintain the blade in position above the table saw surface until the braking system is activated. Such latches are susceptible to becoming accidentally dislodged. Accidental dislodgement can result in undesired delay in shaping activities.

In view of the foregoing, it would be advantageous to provide a power tool with a safety system that does not interfere with shaping procedures. A safety system that did not damage the blade or other shaping device when the safety system is activated would be further advantageous. A further advantage would be realized by a safety system that incorporated inexpensive replacement parts.

SUMMARY

In accordance with one embodiment, a table saw includes a work-piece support surface, a swing arm assembly movable along a swing path between a first swing arm position whereat a portion of a shaping device supported by the swing arm assembly extends above the work-piece support surface and a second swing arm position whereat the portion of the shaping device does not extend above the work-piece support surface, a mechanical fuse positioned to maintain the swing arm assembly in the first swing arm position, an actuator configured to apply a force to the mechanical fuse sufficient to break the mechanical fuse and to force the swing arm assembly away from the first swing arm position and toward the second swing arm position, and a control system configured to actuate the actuator in response to a sensed condition.

In another embodiment, A table saw includes a work piece support surface, a shaping device support shaft automatically retractable along a retraction path from a first position to a second position in response to a sensed condition, wherein the second position is more distal to the work piece support surface than the first position, a mechanical fuse positioned to maintain the shaping device support shaft in the first position, and a control system configured to cause the shaping device support shaft to retract along the retraction path in response to a sensed condition by breaking the mechanical fuse.

In a further embodiment, a power tool includes a latch hold mechanism, a swing arm movable along a swing arm path between an upper first swing arm position and a lower second swing arm position, a mechanical fuse supporting the swing arm assembly in the first swing arm position, an actuating device configured to transfer a first force to the swing arm sufficient to break the mechanical fuse, and a control system configured to control the actuating device.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings illustrate various embodiments of the present disclosure and together with a description serve to explain the principles of the disclosure.

FIG. 1 depicts a top perspective view of a table saw incorporating a mitigation system in accordance with principles of the invention;

FIG. 2 depicts a bottom perspective view of the table saw of FIG. 1 with the housing removed showing a movable carriage mounted on a pivoting frame beneath the work-piece support surface;

FIG. 3 depicts a perspective view of the swing arm assembly of the table saw of FIG. 1;

FIG. 4 depicts a partial perspective cross-sectional view of the swing arm assembly of FIG. 3;

FIG. 5A depicts a perspective view of the mechanical fuse of FIG. 2;

FIG. 5B depicts a side view the swing arm assembly of the table saw supported by a mechanical fuse and including a shock absorber;

FIG. 5C depicts a side view of the swing arm assembly of the table saw including a pull-type of actuator;

FIG. 5D depicts a front view of the swing arm assembly of FIG. 5C;

FIG. 6 depicts a partial perspective view of the swing arm assembly and latch assembly of FIG. 1 after the solenoid has been actuated thereby breaking the mechanical fuse along a break plane perpendicular to the solenoid axis;

FIG. 7 depicts a partial perspective view of the swing arm assembly and latch assembly of FIG. 1 after the swing arm assembly has cleared the latch hold allowing the latch hold to be biased into the swing path;

FIG. 8 depicts a partial perspective view of the swing arm assembly and latch assembly of FIG. 1 after the swing arm assembly has rebounded off of the stop pad and has been captured by a latch hold ledge thereby keeping the shaping device below the surface of the work-piece support surface;

FIG. 9 depicts a partial perspective view of the swing arm assembly and latch assembly of FIG. 1 after the swing arm assembly has rebounded off of the stop pad and has been captured by a secondary latch hold ledge thereby keeping the shaping device below the surface of the work-piece support surface;

FIG. 10 depicts a side view of the swing arm assembly of the table saw including a support rod and a cushion;

FIG. 11 depicts a cross sectional view of the actuator of the table saw;

FIG. 12 depicts a cross sectional view of the actuator of the table saw;

FIG. 13 depicts a partial cross sectional view of the swing arm assembly of the table saw; and

FIG. 14 depicts a top plan view of the table saw of FIG. 1.

Corresponding reference characters indicate corresponding parts throughout the several views. Like reference characters indicate like parts throughout the several views.

DETAIL DESCRIPTION OF THE DISCLOSURE

While the power tools described herein are susceptible to various modifications and alternative forms, specific embodiments thereof have been shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that there is no intent to limit the power tools to the particular forms disclosed. On the contrary, the intention is to cover all combinations of features, modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

Referring to FIG. 1, a table saw 100 is shown. The table saw 100 includes a base housing 102 and a work-piece support surface 104. A splitter 106 is positioned adjacent to a blade 108 which extends from within the base housing 102 to above the work-piece support surface 104. A blade guard (not shown) may be attached to the splitter 106. An angle indicator 110 indicates the angle of the blade 108 with respect to the work-piece support surface 104. A bevel adjust turn-wheel 112 may be used to establish the angle of the blade 108 with respect to the work-piece support surface 104 by pivoting a frame 114 (shown in FIG. 2) within the base housing 102.

A motor 116 which is powered through a switch 118 located on the base housing 102, is supported by a carriage assembly 120. The carriage assembly 120 and a stop pad 122 are supported by the frame 114. The carriage assembly 120 includes a carriage 124 to which the motor 116 is mounted and two guiderails 126/128. The position of the carriage 124 along the guiderails 126/128 is controlled by a blade height turn-wheel 130 through a gearing assembly 132 and a height adjustment rod 134. The carriage 124 fixedly supports a latch assembly 140 and pivotably supports a swing arm assembly 142.

The swing arm assembly 142 is pivotally coupled to the carriage 124 for movement between a fused position (see FIG. 4A) and a de-fused position (see FIG. 7). The swing arm assembly 142 includes a housing 144, which encloses a power wheel 150 that is driven by a power shaft 152. The power shaft 152 may be directly driven by the motor 116 or by a reduction gear. A belt 154 transfers rotational movement from the power wheel 150 to a blade wheel 156. A nut 158 is used to affix the blade 108 (not shown in FIGS. 3 and 4 for purpose of clarity) to the blade wheel 156. A tensioner 160 maintains the belt 154 at a desired tension. Additionally, as shown in FIG. 3, the swing arm assembly 142 may also include a strike plate 146 and a rebound plate 148 mounted on the housing 144.

A latch hold 170 which is part of the latch assembly 140 includes three rebound ledges 174, 176, and 178 (see FIG. 4). The latch assembly 140 further includes a base 180 and an actuator 182 with an actuator pin 184. Two springs 186 and 188 are positioned between the base 180 and the latch hold 170 which is mounted by a pivot 190 to the carriage 124.

A mechanical fuse 500, also shown in FIG. 5A, includes a base 502 coupled with the swing arm assembly 142 and a head 504 coupled to the base 180. The mechanical fuse includes a neck 506 which extends between the base 502 and the head 504. The mechanical fuse 500 may be monolithic. Alternatively, the base 502, neck 506, and head 504 may be formed from different compounds or materials, which are fused, coupled, or connected together. The mechanical fuse 500 is made from materials which are not affected by dust, lubrication, or corrosion. In alternative embodiments, a mechanical fuse may be provided in the form of a shear pin. In such embodiments, the shear pin is aligned with a shear plane that is substantially parallel to the plane in which the swing arm assembly 142 pivots.

The mechanical fuse 500 further includes features and elements for aligning the fuse 500 with the swing arm assembly 142 and the carriage 124. For instance, the mechanical fuse 500 includes a recess 508, which in this embodiment extends completely through the base 510 (FIG. 4D) for accepting a detent, such as a ball detent 510 (FIG. 3), located in the swing arm assembly 142. A slot 512 is provided on the head 504 of the mechanical fuse 500. The slot 512 is configured to accept a fastener 514 (see FIG. 6). Additionally, the fuse 500 includes contact portions 516 and 518 and gripping portions 520 and 522.

The contact portions 516 and 518 are configured to contact guide portions 524 and 526, seen most clearly in FIG. 6. The mechanical fuse is mounted by grasping the gripping portions 520 and 522 and placing the head 504 between the guide portions 524 and 526. Contact between the contact portions 516 and 518 and gripping portions 520 and 522 aligns the slot 512 with a mounting feature (not shown) in the base 180 such that the fastener 514 can be inserted through the slot 512 and coupled to the base 180. The mechanical fuse is then pulled downwardly until the fastener 514 contacts the upper end of the slot 512 at which point the recess 508 is positioned to receive the detent 510. Accordingly, the mechanical fuse 500 and the swing arm assembly 142 are both precisely aligned with the base 180.

The actuator 182 is configured to generate a force sufficient to break the mechanical fuse 500 and to force the swing arm assembly 142 into the de-fused position. As shown in FIG. 5B, the actuator 182 is positioned within the base 180; however, in some embodiments the actuator 182 may be coupled to the swing arm assembly 142 or the frame 114. The actuator 182 includes a pin 182, which is movable along a pin axis 544, as shown in FIG. 5B. The pin axis 544 is approximately perpendicular to a break plane 548 of the mechanical fuse 500. In response to being activated by a controller (not illustrated) the actuator 182 is configured move the pin 184 along the pin axis 544 to break the mechanical fuse 500 along the break plane 548. Depending on the embodiment, the mechanical fuse 500 may be positioned adjacent to the actuator 504.

Operation of the table saw 100 is described with reference to FIGS. 1-5. Initially, the mechanical fuse 500 maintains the swing arm assembly 142 of the table saw 100 in a fused position by coupling the swing arm assembly 142 to the latch hold base 180. The mechanical fuse 500 is configured to maintain the position of the swing arm assembly 142 under normal operational loads of the table saw 100.

In this position, the springs 188 and 186 are under compression and exert a bias on the latch hold 170 about the pivot 190 in a clockwise direction as viewed in FIG. 4. Additionally, the blade wheel 156 is positioned sufficiently close to the work-piece support surface 104 that the blade 108 extends above the work-piece support surface 104 as shown in FIG. 1. A user operates the bevel adjust turn wheel 112 to pivot the frame 114 with respect to the work-piece support surface 104 to establish a desired angle between the blade 108 and the work-piece support surface 104. The user further operates the blade height adjustment turn-wheel 130 to move the carriage 124 along the guiderails 126/128 to establish a desired height of the blade 108 above the work-piece support surface 104.

Using the switch 118, power is then applied to the motor 116 causing the output shaft 152 and the power wheel 150 to rotate. Rotation of the power wheel 150 causes the belt 154 to rotate the blade wheel 156 and the blade 108 which is mounted on the blade wheel 156. A work-piece may then be shaped by moving the work-piece into contact with the blade 108.

The table saw 100 includes a sensing and control circuit (not shown) which activates the actuator 182 in response to a sensed condition. Any desired sensing and control circuit may be used for this purpose. One acceptable sensing and control circuit is described in U.S. Pat. No. 6,922,153, the entire contents of which are herein incorporated by reference. The safety detection and protection system described in the '153 patent senses an unsafe condition and provides a control signal which, in the table saw 100, is used to actuate the actuator 182.

When activated, the actuator 182 drives the actuator pin 184 outwardly from the actuator 182. When the swing arm assembly 142 is maintained in a fused position as shown in FIG. 2, the strike plate 146 is aligned with the actuator 182. Accordingly, as the actuator pin 184 is forced out of the actuator 182, the actuator pin 184 contacts the swing arm assembly 142 and pivots the swing arm assembly 142 in a direction, which applies a force upon the mechanical fuse 500. The mechanical fuse 500 is configured to separate at a predetermined location under a predetermined amount of force along the break plane 548. As shown in FIG. 5B the mechanical fuse 500 is configured to separate at the neck 516, which is the portion of the mechanical fuse 500 at which stress is concentrated. Thus, once the applied force exceeds a tensile strength of the fuse 500, the fuse 500 separates into at least two pieces.

Once the fuse 500 is separated the swing arm assembly 142 is no longer maintained in the fused position. Consequently, the swing arm assembly 142 pivots about the power shaft 152 in the direction of the arrow 200 of FIG. 6 such that the blade wheel 156 moves away from the work-piece support surface 104 through the position shown in FIG. 6 to the position shown in FIG. 7. Accordingly, the blade 108 is pulled by the swing arm assembly 142 in a direction away from the work-piece support surface 104.

As shown in FIGS. 5C and 5D, the actuator 504 may be configured to pivot the swing arm assembly 142 with a “pulling” force instead of a “pushing” force. In this embodiment, an actuator 504 is mounted between a forked section 552 of the swing arm assembly 142. When the actuator 504 is activated, an arm 556 moves downwardly to pull the swing arm assembly 142 to the de-fused position.

As the swing arm assembly 142 moves in the direction of the arrow 200, the rebound plate 148 of the swing arm assembly 142 rotates below the rebound ledge 178 of the latch hold 170. At this point, rotation of the latch hold 170 about the pivot 190 is no longer restrained by the swing arm assembly 142. Accordingly, the springs 186 and 188 cause the latch hold 170 to rotate into a position whereat the rebound ledge 178 is located in the swing path of the swing arm 142, that is, the path along which the swing arm 142 moves, as shown in FIG. 7.

The configuration of FIG. 7 further shows the swing arm assembly 142 rotated to a position whereat the swing arm assembly 142 contacts the stop pad 122. Accordingly, further rotation of the swing arm assembly 142 in the direction of the arrow 200 of FIG. 6 is impeded by the stop pad 122. At this position, the blade 108 is completely located below the work-piece support surface 104. Therefore, an operator above the work-piece support surface 104 cannot be injured by the blade 108.

In one embodiment, the stop pad 122 is made with microcellular polyurethane elastomer (MPE). MPEs form a material with numerous randomly oriented air chambers. Some of the air chambers are closed and some are linked. Additionally, the linked air chambers have varying degrees of communication between the chambers and the orientation of the linked chambers varies. Accordingly, when the MPE structure is compressed, air in the chambers is compressed. As the air is compressed, some of the air remains within various chambers, some of the air migrates between other chambers and some of the air is expelled from the structure. One such MPE is MH 24-65, commercially available from Elastogran GmbH under the trade name CELLASTO®. In other embodiments, a foam material such as “memory foam” may be used.

Use of an MPE or other appropriate material in the stop pad 122 stops rotation of the swing arm assembly 142 without damaging the swing arm assembly 142. Prior to impacting the stop pad 122, however, the swing arm assembly 142 may be moving with sufficient force to cause the swing arm assembly to rebound off of the stop pad 122. In such a circumstance, the swing arm assembly 142 will rotate about the power shaft 152 in a counterclockwise direction. Thus, the blade 108 moves toward the work-piece support surface 104. Movement of the blade 108 above the work-piece support surface 104, however, is inhibited by the latch hold 170.

Specifically, because the springs 186 and 188 bias the latch hold 170 to a location within the swing path of the swing arm assembly 142, movement of the swing arm assembly 142 toward the work-piece support surface 104 brings the rebound plate 148 into contact with the rebound ledge 178 as shown in FIG. 8. In the position of FIG. 8, the blade 108 remains below the surface of the work-piece support surface 104 even after the swing arm assembly 142 rebounds off of the stop pad 122. Therefore, an operator above the work-piece support surface 104 cannot be injured by the blade 108.

The spring constants for the springs 186 and 188 are thus selected to ensure that the latch hold 170 is positioned within the swing path of the swing arm assembly 142 before the swing arm assembly 142 travels from the latched position downwardly into contact with the stop pad 122 and then upwardly to a position whereat the blade 108 is above the work-piece support surface 104. Of course, the time available for moving the latch hold 170 into the swing path can be increased by moving the stop pad 122 further away from the work-piece support surface 104 along the swing path. Such modification increases the overall height of the frame 114, particularly for embodiments with variable blade height. The increased material for the frame 114 results in increased weight. Increased size and weight are generally not desired for movable power tools. Thus, positioning the stop pad 122 closer to the work-piece support surface 104 along the swing path reduces the height of the frame 114 and the resultant weight of the table saw 100.

For some embodiments wherein the stop pad 122 is positioned closer to the work-piece support surface 104 along the swing path, such as the embodiment of FIG. 1, the distance between the swing arm assembly 142 in the latched position and the stop pad 122 is such that the swing arm assembly 142 contacts the stop pad 122 before the rebound plate 148 rotates beneath the rebound ledge 178. Accordingly, the rebound ledges 174 and 176 are provided at locations above the rebound ledge 178 to contact the rebound plate 148 when the swing arm assembly 142 is actuated with the carriage 124 positioned closer to the stop pad 122 as depicted in FIG. 9. In other embodiments, rebound ledges 174 and 176 may be provided as safety measures in the event the latch hold 170 does not move with the designed speed.

The angle and length of the stop pad 122 are selected in the embodiment of FIG. 2 to o ensure that the swing arm assembly 142 contacts the stop pad 122 at the foot 192 (see FIG. 3) regardless of the initial height of the carriage 124. Thus the foot 192 receives the force of the impact when the swing arm assembly 142 contacts the stop pad 122. Accordingly, while the materials used to form the foot 192, the strike plate 146, and the rebound plate 148 are selected to absorb multiple impacts, lighter materials may be used in other areas of the swing arm assembly 142 to minimize weight of the table saw 100.

As illustrated in FIG. 5B, the table saw 100 may include a damper, dashpot, or shock absorber 560 to dissipate the energy of the swing arm assembly 142 as it pivots to the de-fused position. Upon reaching the de-fused position, the shock absorber 560 contacts a striker plate 564 to dissipate the kinetic energy of the swing arm assembly 142. The shock absorber 560 prevents the swing arm assembly 142 from rebounding to the latched position. The shock absorber 560 may be a hydraulic shock absorber having a piston 562, which is moved into a body 566 of the shock absorber 560 upon contacting the striker plate 564. A fluid in the body 566 is heated, compressed, or expelled to dissipate the kinetic energy. As shown in FIG. 5B, the striker plate 564 is coupled to the carriage 124; however, the striker plate 564 may also be coupled to the frame 114.

As illustrated in FIG. 10, the table saw 100 may include a support rod 568 and a cushion 572 to dissipate the energy of the swing arm assembly 142 as it pivots to the de-latched position. The support rod 568 has a curvature, which matches approximately the path taken by the swing arm assembly 142 as it pivots to the de-fused position (see direction 570 of FIG. 10). The cushion 572 is coupled to the end of the support rod 568, and is configured to dissipate the kinetic energy of the swing arm assembly 142. Because the support rod 568 is coupled to the carriage 124 the position of the cushion 572, remains fixed relative the position of the blade 108.

Referring now to FIGS. 11 and 12, the actuator 504 is configured to reduce the shock imparted upon the table saw 100 during activation of the actuator 504. For instance, the actuator 504 in one embodiment is a pyrotechnic actuator, which includes a housing 576, a charge 580, and piston 584 connected to the pin 540. Ignition of the charge 580 generates a large pressure within a chamber 588 in the housing 576. The pressure is imparted upon the piston 584 and results in the pin 540 moving at a very high rate of acceleration. Accordingly, the pressure results in a very high peak transient load in the structure of the table saw 100. To accommodate the peak transient load, the table saw 100 includes a robust frame 114 and portions of the swing arm assembly 142 are hardened. By reducing the transient loads, however, the robustness of the frame 114 and the strength of the materials in the swing arm 142 may be reduced without impacting the dynamic performance of the actuator 504 or slowing movement of the blade 108 to a position below the surface of the work-piece support surface 104.

As illustrated in FIG. 11, one approach to reducing the transient load generated by the actuator 504 is to include a relief valve 592 fluidly coupled to the chamber 588. The relief valve 592 reduces the peak amount of pressure imparted upon the piston 584 in response to the ignition of the charge 580.

Another approach to reducing the peak transient load is illustrated in FIG. 11. As shown in FIG. 11, a divider 596 having an orifice 600 may be included in the chamber 588 to reduce the peak pressure imparted upon the piston 584 following ignition of the charge 580. Additionally, the housing 576 is surrounded by a shock absorbing mounting 604 and a casing 608 to reduce further the peak transient load. The housing 576 is configured for movement relative the casing 608.

The swing arm assembly 142 of FIG. 13, is configured to reduce the shock imparted upon the belt 154 in response to the sudden pivotal motion of the swing arm assembly 142 following activation of the actuator 504. In particular, when the actuator 504 pivots the swing arm assembly 142 in response to a sensed condition, the swing arm assembly 142 moves through a substantial angular range in a fraction of a second, as represented by direction 612 of FIG. 13. The rotation of the swing arm assembly 142 causes the belt 152 to become tighter on an upper side 616 and looser on a lower side 620. If power wheel 150 and the blade wheel 156 have different diameters D the force exerted upon the upper side 616 is not equal to the force exerted on the lower side 620 and the belt 154 may be damaged. If, however, as illustrated in FIG. 13, the power wheel 150 and the blade wheel 156 have the same diameter D, then the force on the upper side 616 of the belt 154 is equal to the force on the lower side 620 of the belt 154, thereby cancelling the damaging effects. In some embodiments the diameter of the power wheel 150 may be within 15% of the diameter of blade wheel 156 without damaging the belt 152.

Once the sensed condition has been cleared, the swing arm assembly 142 is reset by moving the latch hold 170 out of the swing path. This is effected by compressing the springs 188 and 186. The swing arm assembly 142 may then be rotated in a counterclockwise direction about the output shaft 152 until the rebound plate 148 is adjacent to the upper surface of the latch hold 170. The latch hold 170 is then released and the springs 188 and 186 bias the latch hold 170 about the pivot 190 into contact with the lip 164 of the swing arm assembly 142 which restricts rotation of the latch hold 170. Additionally, a new mechanical fuse 500 is positioned in the manner described above.

As shown in FIG. 14 the table saw 100 may include an access door 624 for resetting the swing arm assembly 142. The access door 624 is formed in the work-piece support surface 104. When removed from the work-piece support surface 104, the access door 624 reveals an opening in the work-piece support surface 104 through which the swing arm assembly 142 is accessed. In one embodiment, the access door 624 has a dimension at least fifty percent or more of the diameter of the saw blade 108.

The table saw 100 thus actively monitors for an unsafe condition and initiates mitigation action automatically in the event an unsafe condition is sensed. Additionally, movement and subsequent stopping of the swing arm assembly 172 is accomplished without requiring physical contact with the blade 108. Accordingly, the blade 108 is not damaged by the mitigation action.

Moreover, because the mitigation action does not require interaction with the blade 108, the mitigation system of the table saw 100 may be used with other shaping devices such as sanding wheels, blades with varying dado blades, and molding head cutters, without requiring any modification to the mitigation system. Additionally, because the moving components of the mitigation system can be mounted on the frame 114, the mitigation system can be used with any desired blade height or bevel angle.

The mitigation system discussed with respect to the table saw 100 can be implemented using very light materials, and is thus amenable to incorporation into a variety of power tools including bench top saws and portable saws. For example, the components which are subjected to increased stress within the mitigation system, such as the solenoid pin 184, the latch hold 170, the rebound plate 148, and the strike plate 146, can be made of more durable materials including metals to withstand the impacts and stresses of activating the mitigation system. Other components, including the housings, may be fabricated from more lightweight materials to minimize the weight of the power tool.

While the invention has been illustrated and described in detail in the drawings and foregoing description, the same should be considered as illustrative and not restrictive in character. It is understood that only the preferred embodiments have been presented and that all changes, modifications and further applications that come within the spirit of the invention are desired to be protected.

Claims (15)

The invention claimed is:
1. A power tool, comprising:
a movable latch hold mechanism;
a swing arm movable along a swing arm path between an upper first swing arm position whereat the latch hold mechanism is constrained by the swing arm and a lower second swing arm position whereat the latch hold mechanism is not constrained by the swing arm;
a mechanical fuse supporting the swing arm in the first swing arm position;
an actuating device configured to transfer a first force to the swing arm sufficient to break the mechanical fuse; and
a control system configured to control the actuating device.
2. The power tool of claim 1, wherein:
the actuating device comprises a pin member movable along a first axis; and
the mechanical fuse defines a break plane generally perpendicular to the first axis.
3. The power tool of claim 2, wherein the mechanical fuse comprises:
a first connection portion removably attached to the latch hold mechanism;
a second connection portion supporting the swing arm assembly; and
a neck portion located between the first connection portion and the second connection portion.
4. The power tool of claim 3, wherein the mechanical fuse further comprises:
at least one alignment member configured to align the first connection portion with the latch hold mechanism.
5. The power tool of claim 3, wherein:
the swing arm assembly comprises a ball detent pin; and
the second connection portion comprises a recess configured to receive at least a portion of the ball detent pin therein.
6. The power tool of claim 3, wherein the second connection portion comprises a base portion extending in a first plane and a pair of opposing flanges extending out of the first plane.
7. The power tool of claim 1, wherein the mechanical fuse is positioned adjacent to the actuating device.
8. The power tool of claim 1, wherein the mechanical fuse comprises a shear pin.
9. A power tool, comprising:
a latch hold mechanism;
a swing arm movable along a swing arm path between an upper first swing arm position and a lower second swing arm position;
a mechanical fuse including (i) a first connection portion removably attached to the latch hold mechanism, (ii) a second connection portion supporting the swing arm assembly, and (iii) a neck portion located between the first connection portion and the second connection portion;
an actuating device configured to transfer a first force to the swing arm sufficient to break the mechanical fuse; and
a control system configured to control the actuating device.
10. The power tool of claim 9, wherein:
the actuating device comprises a pin member movable along a first axis; and
the mechanical fuse defines a break plane generally perpendicular to the first axis.
11. The power tool of claim 10, wherein the mechanical fuse further comprises:
at least one alignment member configured to align the first connection portion with the latch hold mechanism.
12. The power tool of claim 10, wherein:
the swing arm assembly comprises a ball detent pin; and
the second connection portion comprises a recess configured to receive at least a portion of the ball detent pin therein.
13. The power tool of claim 10, wherein the second connection portion comprises a base portion extending in a first plane and a pair of opposing flanges extending out of the first plane.
14. The power tool of claim 9, wherein the mechanical fuse is positioned adjacent to the actuating device.
15. The power tool of claim 9, wherein the mechanical fuse comprises a shear pin.
US13/538,422 2009-08-26 2012-06-29 Table saw with mechanical fuse Active US8578825B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US12/548,201 US8210076B2 (en) 2009-08-26 2009-08-26 Table saw with mechanical fuse
US13/538,422 US8578825B2 (en) 2009-08-26 2012-06-29 Table saw with mechanical fuse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13/538,422 US8578825B2 (en) 2009-08-26 2012-06-29 Table saw with mechanical fuse

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US12/548,201 Division US8210076B2 (en) 2009-08-26 2009-08-26 Table saw with mechanical fuse

Publications (2)

Publication Number Publication Date
US20120325065A1 US20120325065A1 (en) 2012-12-27
US8578825B2 true US8578825B2 (en) 2013-11-12

Family

ID=43242523

Family Applications (2)

Application Number Title Priority Date Filing Date
US12/548,201 Active 2030-11-24 US8210076B2 (en) 2009-08-26 2009-08-26 Table saw with mechanical fuse
US13/538,422 Active US8578825B2 (en) 2009-08-26 2012-06-29 Table saw with mechanical fuse

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US12/548,201 Active 2030-11-24 US8210076B2 (en) 2009-08-26 2009-08-26 Table saw with mechanical fuse

Country Status (4)

Country Link
US (2) US8210076B2 (en)
EP (1) EP2289680B1 (en)
CN (1) CN102000877B (en)
TW (1) TWI517955B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130160625A1 (en) * 2011-12-23 2013-06-27 Robert Bosch Gmbh Table Saw Dust Cover

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2969432A4 (en) * 2013-03-15 2016-12-14 Bosch Gmbh Robert Piston for a pneumatic cylinder including a stress concentration structure
US9962778B2 (en) * 2014-12-15 2018-05-08 Robert Bosch Tool Corporation Ratchet and release mechanism for swing arm of table saw
US9969015B2 (en) 2015-03-12 2018-05-15 Robert Bosch Tool Corporation Power tool with protected coupling plate
US10099399B2 (en) 2015-03-12 2018-10-16 Robert Bosch Tool Corporation Object proximity detection in a saw
US9868166B2 (en) 2015-03-12 2018-01-16 Robert Bosch Tool Corporation Power tool with pyrotechnic lockout
US10189098B2 (en) 2015-03-12 2019-01-29 Robert Bosch Tool Corporation Diagnostic and maintenance operation for a saw
US9868167B2 (en) * 2015-03-12 2018-01-16 Robert Bosch Tool Corporation Power tool with drop arm orbit bracket
US9849527B2 (en) * 2015-03-12 2017-12-26 Robert Bosch Tool Corporation Power tool with lightweight actuator housing
US10105863B2 (en) 2015-03-12 2018-10-23 Robert Bosch Tool Corporation System and method for object and operator profiling in an object detection system in a saw
US10493543B2 (en) * 2015-03-12 2019-12-03 Robert Bosch Tool Corporation Power tool motor with reduced electrical noise
US10322522B2 (en) 2015-03-12 2019-06-18 Robert Bosch Tool Corporation Electrical configuration for object detection system in a saw
US10369642B2 (en) 2015-03-12 2019-08-06 Robert Bosch Tool Corporation Power tool with protected circuit board orientation
US10071432B2 (en) 2015-03-12 2018-09-11 Robert Bosch Tool Corporation Power tool with arbor lock
US9914239B2 (en) 2015-03-12 2018-03-13 Robert Bosch Tool Corporation User interface system in a table saw
US10427227B2 (en) 2015-03-12 2019-10-01 Robert Bosch Tool Corporation Drop arm reset method
US9687922B2 (en) * 2015-03-12 2017-06-27 Robert Bosch Tool Corporation Power tool with cammed throat plate
US10213853B2 (en) 2015-03-12 2019-02-26 Robert Bosch Tool Corporation Power tool drop arm with offset ribbing
CN106735541A (en) * 2016-12-23 2017-05-31 济南华信自动化工程有限公司 A kind of multi-functional blanking sawing machine saw cutting device

Citations (73)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2505958A (en) 1946-07-19 1950-05-02 John O Grierson Swinging power saw
US2652863A (en) 1948-05-11 1953-09-22 Edward E Grabinski Power-driven table tool with portable vertical-shaft motor
US2719547A (en) 1952-03-01 1955-10-04 Gjerde Arne Universally adjustable underbench saw
US2844173A (en) 1954-09-13 1958-07-22 King Seely Corp Arbor saw with single handle control of tilt and elevation
US2898893A (en) 1958-04-11 1959-08-11 Little Inc A Impact tool
US2903848A (en) 1956-12-05 1959-09-15 Republic Aviat Corp Self-contained emergency fluid cylinder
US2937672A (en) 1957-10-17 1960-05-24 Gjerde Arne Adjustable motor-driven saw
US3013592A (en) 1959-03-23 1961-12-19 Theodore G Ambrosio Tilting table saw
US3036608A (en) 1959-04-20 1962-05-29 Weber Carl Portable supporting and mounting device for power tools
US3320740A (en) 1965-07-02 1967-05-23 Walker Mfg Co Press
US3344819A (en) 1965-10-20 1967-10-03 Donald H Benson Table saw
US3715697A (en) * 1971-05-24 1973-02-06 Therm O Disc Inc Thermal fuse
US3954051A (en) 1973-12-07 1976-05-04 Hauni-Werke Koerber & Co. Kg Apparatus for clipping wrapped rod-like fillers of fibrous material
US4161272A (en) 1976-12-01 1979-07-17 Mafell-Maschinenfabrik Rudolf Mey Kg Nail driver construction
US4184394A (en) 1977-04-01 1980-01-22 A/S Norcem Motor-driven saw having a circular saw blade
US4336733A (en) 1980-06-06 1982-06-29 Macksoud Albert A Rocking arm saw
US4616447A (en) 1983-02-26 1986-10-14 Mafell-Saschinenfabrik Rudolf Mey GmbH & Co. KG Method and apparatus for machining a workpiece ultrasonically
US4962685A (en) 1988-10-27 1990-10-16 Hagstrom Oscar E Production table saw
US5676319A (en) 1995-10-23 1997-10-14 Stiggins; Kendy Lee Garbage disposal system
US5819625A (en) 1994-12-12 1998-10-13 Black & Decker Inc. Double bevel table saw
US6036608A (en) 1999-05-07 2000-03-14 Morris; John K. Golf putting and chipping training apparatus
DE20007037U1 (en) 2000-04-17 2000-07-20 Mafell Ag table saw
US20020020265A1 (en) 2000-08-14 2002-02-21 Gass Stephen F. Translation stop for use in power equipment
US6530303B1 (en) 1999-06-10 2003-03-11 Black & Decker Inc. Table saw
US6536536B1 (en) 1999-04-29 2003-03-25 Stephen F. Gass Power tools
US20040035595A1 (en) 2000-08-15 2004-02-26 Fisher Hugh Edward Cam operated devices
US20040159198A1 (en) 2003-01-31 2004-08-19 Peot David G. Table saw with cutting tool retraction system
DE202004012468U1 (en) 2003-11-21 2004-11-04 Festool Gmbh Table saw has carriage to support work for movement with respect to circular saw blade and drive shaft with handle having saw control switch
US6813983B2 (en) 2000-09-29 2004-11-09 Sd3, Llc Power saw with improved safety system
US6826988B2 (en) 2000-09-29 2004-12-07 Sd3, Llc Miter saw with improved safety system
US6857345B2 (en) 2000-08-14 2005-02-22 Sd3, Llc Brake positioning system
US6877410B2 (en) 2000-09-29 2005-04-12 Sd3, Llc Miter saw with improved safety system
US6880440B2 (en) 2000-09-29 2005-04-19 Sd3, Llc Miter saw with improved safety system
US6920814B2 (en) 2000-08-14 2005-07-26 Sd3, Llc Cutting tool safety system
US6922153B2 (en) 2003-05-13 2005-07-26 Credo Technology Corporation Safety detection and protection system for power tools
US20050166736A1 (en) 2004-01-29 2005-08-04 Gass Stephen F. Table saws with safety systems and systems to mount and index attachments
US6945148B2 (en) 2000-09-29 2005-09-20 Sd3, Llc Miter saw with improved safety system
US6945149B2 (en) 2001-07-25 2005-09-20 Sd3, Llc Actuators for use in fast-acting safety systems
US6994004B2 (en) 2000-09-29 2006-02-07 Sd3, Llc Table saw with improved safety system
US6997090B2 (en) 2001-08-13 2006-02-14 Sd3, Llc Safety systems for power equipment
US7000514B2 (en) 2001-07-27 2006-02-21 Sd3, Llc Safety systems for band saws
US7024975B2 (en) 2000-08-14 2006-04-11 Sd3, Llc Brake mechanism for power equipment
US7029384B2 (en) 2003-06-27 2006-04-18 Festool Gmbh Grinding disk
US7055417B1 (en) 1999-10-01 2006-06-06 Sd3, Llc Safety system for power equipment
US7077039B2 (en) 2001-11-13 2006-07-18 Sd3, Llc Detection system for power equipment
US7098800B2 (en) 2003-03-05 2006-08-29 Sd3, Llc Retraction system and motor position for use with safety systems for power equipment
US7100483B2 (en) 2000-08-14 2006-09-05 Sd3, Llc Firing subsystem for use in a fast-acting safety system
US7137326B2 (en) 2000-08-14 2006-11-21 Sd3, Llc Translation stop for use in power equipment
US7171879B2 (en) 2001-07-02 2007-02-06 Sd3, Llc Discrete proximity detection system
US7197969B2 (en) 2001-09-24 2007-04-03 Sd3, Llc Logic control with test mode for fast-acting safety system
US20070074612A1 (en) 2005-10-04 2007-04-05 Ben Yu Worktable having adjustable shield
US7210383B2 (en) 2000-08-14 2007-05-01 Sd3, Llc Detection system for power equipment
US7225712B2 (en) 2000-08-14 2007-06-05 Sd3, Llc Motion detecting system for use in a safety system for power equipment
US7231856B2 (en) 2001-06-13 2007-06-19 Sd3, Llc Apparatus and method for detecting dangerous conditions in power equipment
US7284467B2 (en) 2000-08-14 2007-10-23 Sd3, Llc Apparatus and method for detecting dangerous conditions in power equipment
US7290472B2 (en) 2002-01-14 2007-11-06 Sd3, Llc Miter saw with improved safety system
US7290967B2 (en) 2004-02-13 2007-11-06 Festool Gmbh Dust extractor device for a router
US7308843B2 (en) 2000-08-14 2007-12-18 Sd3, Llc Spring-biased brake mechanism for power equipment
US7350445B2 (en) 2003-08-20 2008-04-01 Sd3, Llc Brake cartridge for power equipment
US7350444B2 (en) 2000-08-14 2008-04-01 Sd3, Llc Table saw with improved safety system
US7353737B2 (en) 2001-08-13 2008-04-08 Sd3, Llc Miter saw with improved safety system
US7357056B2 (en) 2000-09-29 2008-04-15 Sd3, Llc Cutting tool safety system
US7359174B2 (en) 2000-08-14 2008-04-15 Sd3, Llc Motion detecting system for use in a safety system for power equipment
US7377199B2 (en) 2000-09-29 2008-05-27 Sd3, Llc Contact detection system for power equipment
US7472634B2 (en) 2003-08-20 2009-01-06 Sd3, Llc Woodworking machines with overmolded arbors
US7475542B2 (en) 2005-03-24 2009-01-13 Snpe Materiaux Energeriques Pyrotechnic actuator furnished with a pressure regulator member
US7481140B2 (en) 2005-04-15 2009-01-27 Sd3, Llc Detection systems for power equipment
US7509899B2 (en) 2000-08-14 2009-03-31 Sd3, Llc Retraction system for use in power equipment
US7536238B2 (en) 2003-12-31 2009-05-19 Sd3, Llc Detection systems for power equipment
US7600455B2 (en) 2000-08-14 2009-10-13 Sd3, Llc Logic control for fast-acting safety system
US7628101B1 (en) 2006-03-13 2009-12-08 Power Tool Institute Pyrotechnic drop mechanism for power tools
US7721633B2 (en) 2006-10-24 2010-05-25 Gaw Stanley E Dual bevel table and slide miter saw
US8065943B2 (en) 2000-09-18 2011-11-29 Sd3, Llc Translation stop for use in power equipment

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5119555A (en) * 1988-09-19 1992-06-09 Tini Alloy Company Non-explosive separation device
WO2003006213A2 (en) * 2001-07-11 2003-01-23 Black & Decker Inc. Power tool safety mechanisms
US7241315B2 (en) * 2001-07-23 2007-07-10 Robert Evans Femoral head resurfacing apparatus and methods

Patent Citations (87)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2505958A (en) 1946-07-19 1950-05-02 John O Grierson Swinging power saw
US2652863A (en) 1948-05-11 1953-09-22 Edward E Grabinski Power-driven table tool with portable vertical-shaft motor
US2719547A (en) 1952-03-01 1955-10-04 Gjerde Arne Universally adjustable underbench saw
US2844173A (en) 1954-09-13 1958-07-22 King Seely Corp Arbor saw with single handle control of tilt and elevation
US2903848A (en) 1956-12-05 1959-09-15 Republic Aviat Corp Self-contained emergency fluid cylinder
US2937672A (en) 1957-10-17 1960-05-24 Gjerde Arne Adjustable motor-driven saw
US2898893A (en) 1958-04-11 1959-08-11 Little Inc A Impact tool
US3013592A (en) 1959-03-23 1961-12-19 Theodore G Ambrosio Tilting table saw
US3036608A (en) 1959-04-20 1962-05-29 Weber Carl Portable supporting and mounting device for power tools
US3320740A (en) 1965-07-02 1967-05-23 Walker Mfg Co Press
US3344819A (en) 1965-10-20 1967-10-03 Donald H Benson Table saw
US3715697A (en) * 1971-05-24 1973-02-06 Therm O Disc Inc Thermal fuse
US3954051A (en) 1973-12-07 1976-05-04 Hauni-Werke Koerber & Co. Kg Apparatus for clipping wrapped rod-like fillers of fibrous material
US4161272A (en) 1976-12-01 1979-07-17 Mafell-Maschinenfabrik Rudolf Mey Kg Nail driver construction
US4184394A (en) 1977-04-01 1980-01-22 A/S Norcem Motor-driven saw having a circular saw blade
US4336733A (en) 1980-06-06 1982-06-29 Macksoud Albert A Rocking arm saw
US4616447A (en) 1983-02-26 1986-10-14 Mafell-Saschinenfabrik Rudolf Mey GmbH & Co. KG Method and apparatus for machining a workpiece ultrasonically
US4962685A (en) 1988-10-27 1990-10-16 Hagstrom Oscar E Production table saw
US5819625A (en) 1994-12-12 1998-10-13 Black & Decker Inc. Double bevel table saw
US5676319A (en) 1995-10-23 1997-10-14 Stiggins; Kendy Lee Garbage disposal system
US7121358B2 (en) 1999-04-29 2006-10-17 Gass Stephen F Power tools
US7328752B2 (en) 1999-04-29 2008-02-12 Gass Stephen F Power tools
US7540334B2 (en) 1999-04-29 2009-06-02 Gass Stephen F Power tools
US6536536B1 (en) 1999-04-29 2003-03-25 Stephen F. Gass Power tools
US6834730B2 (en) 1999-04-29 2004-12-28 Stephen F. Gass Power tools
US7093668B2 (en) 1999-04-29 2006-08-22 Gass Stephen F Power tools
US6036608A (en) 1999-05-07 2000-03-14 Morris; John K. Golf putting and chipping training apparatus
US20030089212A1 (en) 1999-06-10 2003-05-15 Parks James R. Table saw
US6530303B1 (en) 1999-06-10 2003-03-11 Black & Decker Inc. Table saw
US7347131B2 (en) 1999-10-01 2008-03-25 Sd3, Llc Miter saw with improved safety system
US7055417B1 (en) 1999-10-01 2006-06-06 Sd3, Llc Safety system for power equipment
US7525055B2 (en) 1999-10-01 2009-04-28 Sd3, Llc Switch box for power tools with safety systems
DE20007037U1 (en) 2000-04-17 2000-07-20 Mafell Ag table saw
US7308843B2 (en) 2000-08-14 2007-12-18 Sd3, Llc Spring-biased brake mechanism for power equipment
US7137326B2 (en) 2000-08-14 2006-11-21 Sd3, Llc Translation stop for use in power equipment
US6920814B2 (en) 2000-08-14 2005-07-26 Sd3, Llc Cutting tool safety system
US7359174B2 (en) 2000-08-14 2008-04-15 Sd3, Llc Motion detecting system for use in a safety system for power equipment
US7600455B2 (en) 2000-08-14 2009-10-13 Sd3, Llc Logic control for fast-acting safety system
US6857345B2 (en) 2000-08-14 2005-02-22 Sd3, Llc Brake positioning system
US20020020265A1 (en) 2000-08-14 2002-02-21 Gass Stephen F. Translation stop for use in power equipment
US6957601B2 (en) 2000-08-14 2005-10-25 Sd3, Llc Translation stop for use in power equipment
US7284467B2 (en) 2000-08-14 2007-10-23 Sd3, Llc Apparatus and method for detecting dangerous conditions in power equipment
US7228772B2 (en) 2000-08-14 2007-06-12 Sd3, Llc Brake positioning system
US7100483B2 (en) 2000-08-14 2006-09-05 Sd3, Llc Firing subsystem for use in a fast-acting safety system
US7225712B2 (en) 2000-08-14 2007-06-05 Sd3, Llc Motion detecting system for use in a safety system for power equipment
US7024975B2 (en) 2000-08-14 2006-04-11 Sd3, Llc Brake mechanism for power equipment
US7210383B2 (en) 2000-08-14 2007-05-01 Sd3, Llc Detection system for power equipment
US7509899B2 (en) 2000-08-14 2009-03-31 Sd3, Llc Retraction system for use in power equipment
US7350444B2 (en) 2000-08-14 2008-04-01 Sd3, Llc Table saw with improved safety system
US20040035595A1 (en) 2000-08-15 2004-02-26 Fisher Hugh Edward Cam operated devices
US8065943B2 (en) 2000-09-18 2011-11-29 Sd3, Llc Translation stop for use in power equipment
US7357056B2 (en) 2000-09-29 2008-04-15 Sd3, Llc Cutting tool safety system
US6945148B2 (en) 2000-09-29 2005-09-20 Sd3, Llc Miter saw with improved safety system
US6877410B2 (en) 2000-09-29 2005-04-12 Sd3, Llc Miter saw with improved safety system
US6813983B2 (en) 2000-09-29 2004-11-09 Sd3, Llc Power saw with improved safety system
US6826988B2 (en) 2000-09-29 2004-12-07 Sd3, Llc Miter saw with improved safety system
US6880440B2 (en) 2000-09-29 2005-04-19 Sd3, Llc Miter saw with improved safety system
US6994004B2 (en) 2000-09-29 2006-02-07 Sd3, Llc Table saw with improved safety system
US7377199B2 (en) 2000-09-29 2008-05-27 Sd3, Llc Contact detection system for power equipment
US7231856B2 (en) 2001-06-13 2007-06-19 Sd3, Llc Apparatus and method for detecting dangerous conditions in power equipment
US7591210B2 (en) 2001-07-02 2009-09-22 Sd3, Llc Discrete proximity detection system
US7171879B2 (en) 2001-07-02 2007-02-06 Sd3, Llc Discrete proximity detection system
US6945149B2 (en) 2001-07-25 2005-09-20 Sd3, Llc Actuators for use in fast-acting safety systems
US7000514B2 (en) 2001-07-27 2006-02-21 Sd3, Llc Safety systems for band saws
US6997090B2 (en) 2001-08-13 2006-02-14 Sd3, Llc Safety systems for power equipment
US7353737B2 (en) 2001-08-13 2008-04-08 Sd3, Llc Miter saw with improved safety system
US7197969B2 (en) 2001-09-24 2007-04-03 Sd3, Llc Logic control with test mode for fast-acting safety system
US7421315B2 (en) 2001-11-13 2008-09-02 Sd3, Llc Detection system for power equipment
US7077039B2 (en) 2001-11-13 2006-07-18 Sd3, Llc Detection system for power equipment
US7290472B2 (en) 2002-01-14 2007-11-06 Sd3, Llc Miter saw with improved safety system
US7698975B2 (en) 2003-01-31 2010-04-20 Techtronic Power Tools Technology Limited Table saw with cutting tool retraction system
US20040159198A1 (en) 2003-01-31 2004-08-19 Peot David G. Table saw with cutting tool retraction system
US7098800B2 (en) 2003-03-05 2006-08-29 Sd3, Llc Retraction system and motor position for use with safety systems for power equipment
US6922153B2 (en) 2003-05-13 2005-07-26 Credo Technology Corporation Safety detection and protection system for power tools
US20050268767A1 (en) 2003-05-13 2005-12-08 Credo Technology Corporation Safety detection and protection system for power tools
US7029384B2 (en) 2003-06-27 2006-04-18 Festool Gmbh Grinding disk
US7472634B2 (en) 2003-08-20 2009-01-06 Sd3, Llc Woodworking machines with overmolded arbors
US7350445B2 (en) 2003-08-20 2008-04-01 Sd3, Llc Brake cartridge for power equipment
DE202004012468U1 (en) 2003-11-21 2004-11-04 Festool Gmbh Table saw has carriage to support work for movement with respect to circular saw blade and drive shaft with handle having saw control switch
US7536238B2 (en) 2003-12-31 2009-05-19 Sd3, Llc Detection systems for power equipment
US20050166736A1 (en) 2004-01-29 2005-08-04 Gass Stephen F. Table saws with safety systems and systems to mount and index attachments
US7290967B2 (en) 2004-02-13 2007-11-06 Festool Gmbh Dust extractor device for a router
US7475542B2 (en) 2005-03-24 2009-01-13 Snpe Materiaux Energeriques Pyrotechnic actuator furnished with a pressure regulator member
US7481140B2 (en) 2005-04-15 2009-01-27 Sd3, Llc Detection systems for power equipment
US20070074612A1 (en) 2005-10-04 2007-04-05 Ben Yu Worktable having adjustable shield
US7628101B1 (en) 2006-03-13 2009-12-08 Power Tool Institute Pyrotechnic drop mechanism for power tools
US7721633B2 (en) 2006-10-24 2010-05-25 Gaw Stanley E Dual bevel table and slide miter saw

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Photograph of Mafell Erika 70Ec Pull-Push saw, downloaded Oct. 29, 2009 from http://www.maschinensucher.de/ma2/bilderanzeigen-A600704-1-english.html.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130160625A1 (en) * 2011-12-23 2013-06-27 Robert Bosch Gmbh Table Saw Dust Cover
US8844415B2 (en) * 2011-12-23 2014-09-30 Robert Bosch Gmbh Table saw dust cover

Also Published As

Publication number Publication date
CN102000877B (en) 2015-06-03
EP2289680A3 (en) 2014-03-12
EP2289680A2 (en) 2011-03-02
US8210076B2 (en) 2012-07-03
US20120325065A1 (en) 2012-12-27
US20110048192A1 (en) 2011-03-03
TWI517955B (en) 2016-01-21
EP2289680B1 (en) 2016-03-23
TW201111133A (en) 2011-04-01
CN102000877A (en) 2011-04-06

Similar Documents

Publication Publication Date Title
US10442108B2 (en) Table saws
US7698975B2 (en) Table saw with cutting tool retraction system
JP4461046B2 (en) Reciprocating work tool
US9522476B2 (en) Power equipment with detection and reaction systems
JP3706380B2 (en) Elastic rope
US7610836B2 (en) Replaceable brake mechanism for power equipment
US6588526B1 (en) Front hood assembly
US8065943B2 (en) Translation stop for use in power equipment
EP0379322B1 (en) Miter saw
US7955162B2 (en) Guard anti-rotation lock device
US5724875A (en) Guard and control apparatuses for sliding compound miter saw
US7866239B2 (en) Elevation mechanism for table saws
JP4420569B2 (en) Front bonnet structure
US20070241548A1 (en) Steering wheel retracting device for vehicle
JP2009506936A (en) Automotive hood hinge assembly to protect pedestrians
US20130056610A1 (en) Mobile base for a table saw
US20050252187A1 (en) Cutting tool safety system
US7353737B2 (en) Miter saw with improved safety system
US20020066346A1 (en) Miter saw with improved safety system
CA2453352C (en) Power tool safety mechanisms
WO2000064646A3 (en) Cutting tool
CN1040959C (en) Nose block assmelby for crusher
US8439420B2 (en) Dual stage variable load energy absorber for vehicle seating
US7628101B1 (en) Pyrotechnic drop mechanism for power tools
US20020059855A1 (en) Miter saw with improved safety system

Legal Events

Date Code Title Description
AS Assignment

Owner name: ROBERT BOSCH TOOL CORPORATION, ILLINOIS

Free format text: MERGER;ASSIGNOR:CREDO TECHNOLOGY CORPORATION;REEL/FRAME:028544/0953

Effective date: 20091231

Owner name: ROBERT BOSCH GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:OBERHEIM, STEPHEN C.;REEL/FRAME:028544/0758

Effective date: 20090831

Owner name: CREDO TECHNOLOGY CORPORATION, ILLINOIS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:OBERHEIM, STEPHEN C.;REEL/FRAME:028544/0758

Effective date: 20090831

STCF Information on status: patent grant

Free format text: PATENTED CASE

FPAY Fee payment

Year of fee payment: 4